Hi Masterclass,
It is difficult to decide what a "good rating" is. Each to their own.
The ratings initially start at 1200 and fluctuate for a while, then flatten out to give an accurate rating.
Here is some further info on how the ratings and scores work:
http://www.chess.com/article/view/chess-ratings---how-they-work
Regards
Hydra
What is supposed to be a good rating in chess.com? If the rating is say 1900, can any equivalent ELO ratings can be assigned?